Static And Dynamic Performance Analysis Of Joint Of Concrete Filled Steel Tube Lattice Wind Iurbine Tower

With the generation capacity increase of wind turbine, the height of wind turbine tower and the equipment weight of the tower top are increased gradually and at present the cone table type tower is easy unstable failure and has low reliability and also has the limits of transportation height that make it difficult to go to high development. The wind turbine tower structure of concrete filled steel tube with lattice combines the advantages of steel and concrete structures, but having many nodes and the force very complex, the research has not yet matured at home and abroad.In order to investigate the nodes mechanism of the wind turbine tower structure of concrete filled steel tube with lattice, the paper design the wind turbine tower structure of concrete filled steel tube with lattice and research the nodes. In the conditions of the equal web member section area and changing the web member of the section form, using finite element software ABAQUS research the nodes mechanical behavior of the wind turbine tower structure of concrete filled steel tube with lattice. The results show that:In the situation of the web member and node plate bearing capacity satisfy requirements, the nodes of round steel tube is vulnerable damage in the rod on both sides of the tower column tube wall area. The stress of single angle web member nodes and double angle web member nodes is larger at both ends of the gusset plate and towers wall junction that is weak positions. Through the round steel tube web member nodes parameter analysis, we can conclude that the failure mode of nodes is the buckling damage of compression web member, when web member-tower column diameter ratio is in the range of0.22～0.4and the tower column diameter-thick ratio is less than28.75and web member diameter-thick ratio is more than12.7. Under the seismic loads, the nodes mechanical behavior of round steel tube web member lattice type steel pipe concrete wind turbine tower is better. Under the action of repeated loading, three kinds of web member section forms of the lattice type steel pipe concrete wind turbine tower nodes M-φ hysteresis curve are in full "spindle" that have no obvious "pinch shrinkage" phenomenon and equivalent viscous damping coefficient is0.42～0.5that is4～5times of reinforced concrete node which indicate that three different web member section forms of nodes have very good seismic performance and energy consumption.